I seriously don't understand how you can make a video and put the music after you're done with it.
I just don't put music when i'm in progress of the vid,i already have the music and i listen to it like 5 times and then i know the timing and do vids without the music as a wip,then at the final i will post the music when it's finished.
Did the exact thing with Toribash-Swexx(can be seen in my signature)